Also describing the lottery mechanism without any gotcha is the right thing to do for consumers, and being in the unique position you are, you have the opportunity to lead that change.
That sounds like a super-awful kind of savings account, but I think this argument assumed that many numbers-game players' next-most-preferred use of the money they would bet on it was even less like savings, so it could still be helpful by pulling money away from other things. Of course, that's a pretty big and pretty specific assumption.
This project and the idea that inspired it are a way better form of savings because the savers can actually access their principal and don't actually have to pay the bank.
First, the difference between being mistaken and lying is intent. The site guidelines call for being charitable. So unless you can prove intent, don't call out someone for lying.
Second: Just saying someone is wrong/mistaken/lying turns into a five-year-old's argument: "Am not!" "Are too!" That's not a useful conversation, nor even an interesting one. Instead, supply some evidence that the rest of us can look at and judge whether you're right. (Actual evidence might even convince the person you were replying to - some of us here do actually listen to facts from time to time.)